Porated



Feb. 3; 1931. F. s. HAAS ATTACHMENT FOR MACHINE TOOLS Filed May 25, 1927 Patented Feb. 3, 1931 UNITED STATES PATENT, OFF-ICE, I.

FRED s. Hens, or cINcINNArI, OHIO, nssrenon T0 CINCINNATI GnINDnRs INooR- PORATEZD, or CINCINNA I, OHIO, n CORPORATION or OHIO ATTACHMENT roR'MAcHINn TOOLS Application filed May 25,

This invention relates to improvements in machine tools and has particular reference to a control device for use in connectionwith grinding machines or similar mechanisms.

In various forms of machine tools it is customary to make use of either a movable table wheel slide or the like designed to reciprocate for proper relative traversing movement of the tool and work. It has been found desirshall accomplish the foregoing results, which shall be simple of construction, capable of ready coarse adjustment and of subsequent V fine adjustment for most accurate positioning thereof.

Other objects and advantages'of the present invention should be readily apparent by reference to the following specification taken 7 in conjunction with the accompanying drawing, and it will be understood that Imay.

make any modifications in the specific structural details hereinafter described within the scope of the appended claims without departing from or exceeding the spirit of th invention.

Figure 1 is a fragmentary elevation of a machine tool showing my improvement applied thereto. V

Figure 2 is an enlarged detail'view of the adjustable dog and supporting parts therefor. Figure 3iis a section on line 3-3 of Figure 2 and I Figure 4 is a section on line 4-4 of Fig ure 3.

In the drawings the letter A designates pin 15. The bell crank is provided as its up- 1927. Serial No. 194,187.

clearly illustrated in Figure 1 Slide 12 isin the form of a hollow shell or casing having the interior recess as at 13 within which is pivotally mounted bell crank 14 swinging on per end with a knurledhandle 16 projecting forwardly through aperture 17 in the front of slide 12. Disposed on the slide adjacent aperture 17 is a second knurled handle member 18, members 16 and 18 being formed with alined sockets 19 and 20, respectively receiving the ends of the interposed compression spring 21'which serves to, force the handles apart. This forcing. apart of the handles rocks bell crank 14 to moveits lower substantially horizontal end upwardly in the direction of the serrations or teeth 11. This lower arm of the bell crank is provided witha threaded stud or tang 22 on which is rotatably mounted nut 23 having knurled oper-' ating portion 24 and a peripheral bevelled flange ordisk 25 acting as a detent to interlock in the space between a selected pair of teeth 11. In operating my improved adjustable dog handles 16 and 18 are grasped and pressed together against the yielding resistance of spring 21, thus swinging disk 25 downward out of engagement with the lower edge of rack plate 10. When in this position the slide may be freely moved'back and forth to approximately correct position. Upon releasing of the handles spring 21 will swing disk 25 upward into. engagement with the nearest adjacent notch, thus locking the structure in its adjusted position. If it is desired to. impart slight movements less than a tooth'width for example in'extent to the slide member, this may be readily accomplished by rotation of nut 24 on tang 22. In

this action the nut remains stationary and in engagement with a given tooth, while the slide is fed back and forth relative thereto.

It "will be understood'that the mechanism here described is adapted for; interengagement with the reversing lever Cor other trip or machine tool instrumentality; As'shown, lever C is formed with a springpressed abut-. ment pin 26 normally urged into path of the slide 12 by a spring27, so that as the table moves it will; engage the pin to actuate the reversing lever. However, if it is desired to allow the parts to feed by without actuation of the lever this can be accomplished by grasping head 28 and withdrawing member 26 out of the path of the actuating dog. Similarly', on movement in the Opposite direction the head 29 on member 26 will ride in cam groove 30 in the face of the slide to pass by the lever without jamming.

'F'r'orn theferegeing descriptio it will be seen that I have provided a simple and efficient table control dog for use on a machine tool which may be most simply constructed, readily given a coarse adjustment and with equal facility given a very fine adjustment to most accurately position the member for the proper tripping action.

1.- The combination with a machine tool having a guide, of adjustable trip mecha nis'm ror cooperation therewith, including a slide, a bell crank interniediately pivoted to the slide, means for rocking the bell crank, said bell erankhaving athreaded tang, a nut carried by the tang, and means on the nut for interlocking engagement with the guide on rocking of the bell crank in one direction, whereby the device as an entirety may be shifted along the guide by disengagement of the nut,- orthe slide may be shifted relative to the nut by rotation of the latter.

2; In a mechanism of the character de-' scribed, the combination of a guide plate having a rack portion, of a slide movable along the plate, an arm pivoted to the slide and provided with a terminal threaded tang, a nutmounted on the tang, having rack engaging flange, and means for urging the nut into engagement with the rack, substantially as and for the purpose described.

3. A-control dog of the character described, including a slide, a bell crank pivotally sup orted thereby, an actuating handle on the en crank, a second handle on the slide, whereby grasping of the handles will rock the bell crank in one direction, resilient means for urging the bell crank in the o posits direction, said bell crank having a threaded portion, and a nut engaged on the threaded portion having a knurledoperating portion and having a peripheral projecting flange substantially as and for the purpose described. 7 j H I 4. quick ustable table dogof the character described, including a, slide, an arm pivoted: thereto and terminating in a threaded portion, means for positively actuating the arm in one direction, means for resiliently actuating the arm in the opposite direction,- and a control nut carried by the threaded portion having an actuating portion for rotation of the nut and having an outwardly extending bevelled peripheral flange. integral therewith for interlocking engagement with a positioning rack, substantially as and for the purpose described.

5. The combination with a guide rack, of a quick adjustable control dog carried thereby and including a slide member, a bell crank interior'ly pivoted to the slide and having a forwardly projecting operating handle portion and a transversely extending projecting threaded tang, a handle member on the slide adjacent ,the operating handle ortion,

whereby said parts may be pressed together to swing the threaded tang into an inoperative position, resilient means interposed between the operating handles for swinging the tang in the opposite direction and a combined detent and nut member having a flangedperipheral extension for engagement with the guide rack and having a knurled operating portion of reduced size to facilitate' rotation of the nut for fine adjustments of the slide.- 7 V 6.- In a device of the class described the combination of a guide plate having a rack portion thereon, a slide movable along said guide plate and means pivotally carried by the slide for engagement with the rack portion of the guide plate for roughly positioning the slide thereon, said means being further adjustable for minutely adjusting the position or the slide on the guide plate.

7 In a device of the class described the combination of a guide bar having rack teeth thereon, a slide carried by the guide bar and movable relative thereto, means carried by the slide cooperating with the rack teeth of the guide bar for securing the slide in coarse adjusted positions relative to the guide bar, and means for adjusting the last mentioned means to finely adjust the position of the slide relative to the guide bar.

8; In a device of the class described the combination of a guide bar having a pluralit of rack teeth extending therefrom and having a space between'each pair of adjacent teeth, a slide carried by the guide bar and movable therealong' in a plane parallel with the longitudinal extent of the bar, means carried by the slide adapted to be received within the space between the rack teeth for locking the slide in adjusted positions on the bar, and means for actuating the last mentioned means in a plane transversely to the plane of movement of the slide along the guide bar for. minutely adjusting theslide relative to the said guide *bar.

10. In a device of the class described the combination of a guide plate, aslide carried thereby and adjustable relative thereto, means carried by the slide engaging the guide plate for locking the slide to the guide plate in adjusted positions, means cooperating with the locking means for finely adjusting the slide along the guide plate relative to said locking means, and means yieldingly resisting disengagement of the locln'ng means and guide plate. i

In testimony whereof I aflix my signature.

FRED S. HAAS. 

